When

Before you start to mess your AppKernel and parameters.yml. When you don't need
fatty fat bundles like Doctrine or Swiftmailer or ide-validation-less annotations.

Where

Add this lib to the composer.json of your Symfony project. Add the install script for
Composer. Rewrite the AppKernel like you can see in iinano. Remove parameters.yml
(and its reference). Remove Incenteev reference in composer.json.

Y U NO use Incenteev ?

This lib does not provide a way to prepare a parameters.yml for the preprod server,
for example, so your sysadmin does not get mad when he's installing your app at 1:00 AM.
Only the file for the production server needs to be in gitignore.